Illinois weather in March
One place stands in for Illinois here — these are Chicago's numbers, not a statewide average.
Based on 1 weather station, in Chicago. One station — Chicago, where Lake Michigan runs the thermostat; downstate summers come hotter, and the far south of the state sees gentler winters.
Chicago & the Lakefront
Highs near 47°, nights around 31°, and 5.5 in of snow in a typical March.
| Place | Highs / lows | Wet days | Snow | The short version |
|---|---|---|---|---|
| Chicago | 47° / 31° | 4 | 5.5 in | Thaw and refreeze, week by week — waterproof boots earn their keep. |
Each place above has its own page for the full story — what the month feels like, what to pack, and whether the timing is right.